PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/23-20:27:50
G02     76.8           20.4                7.2 +/-    1.26      15.6 +/-    1.26  0.030 / 0.060
G05     44.7           40.1                5.6 +/-    0.95       8.2 +/-    0.95  0.040 / 0.050
G13     106.9          29.6               10.1 +/-    0.82      17.9 +/-    0.82  0.070 / 0.130
G15     154.0          29.9               12.1 +/-    1.97      21.3 +/-    1.97  0.120 / 0.150
G20     228.5          -14.5              21.7 +/-    2.14      54.7 +/-    2.14  0.120 / 0.150
G21     289.9          30.2                8.9 +/-    0.86      15.5 +/-    0.86  0.130 / 0.190
G25     212.6          32.1               11.7 +/-    1.77      19.6 +/-    1.77  0.100 / 0.140
G26     310.6          16.8                8.2 +/-    1.07      19.6 +/-    1.07  0.080 / 0.120
G29     344.3          76.7                8.8 +/-    0.35       9.0 +/-    0.35  0.050 / 0.110